Tension mechanism for warp beams



Dec. 8, T. MOUNSEY ET AL TENSION MECHANISM FOR WARP BEAMS Filed Aug. 29- 1924 3 Sheets-Sheet 1 Dec. 8,

l T. MOUNSEY ET AL TENSION MECHANISM FOR WARP BEAMS 1924 3 Sheets-Sheet 2 Filed Auz. 29

Dec. 8, 1925- 1,564,610

T. MOUNSEY ET Al.

TENSION MECHANISM FOR WARP BEAMS Filed Aug. 29- 1 s Sheets-Sheet 5 Patented Dec. 8, 1925.

UNITED STATES THOMAS MOUN'SEY AND ROBERT BAGW'ELL, OF PRESTON, ENGLAND.

TENSION IEEOHANISM FOR WARP BEAMS.

Application filed August as, 1924. .Serial No. 735,011.

To all whom it may concern:

Be it known that we, THOMAS MoUNsnY and Bonner BAGWELL, both subjects of the King of England, and both residing at Preston, in the county of Lancaster, England, have invented certain new and useful Improvements in Tension Mechanism for arp Beams, of which the following is a specification.

This invention relates to tension mechanism for the warp beams of looms of the kind in which a friction band consisting of a series of links or friction blocks pivotally connected together is adapted to be wrapped around friction drums or ruiiles at the ends of the warp beam.

Hitherto both ends of such friction bands have been anchored to the frame or other relatively fixed part of the loom by means of a spring or springs, the friction being controlled by varying the compression or tension of such anchoring springs. In such constructions the anchoring springs also served to take up shocks due to the movement of the healds.

According to the present invention means are provided for varyingthe friction of the friction band about the ruffle independently of the resilient means for anchoring the band to the frame or other relatively fixed part of the loom. To this end the tension of the band surrounding the ruffle is conveniently maintained by a spring tending to draw the ends of the band together about the ruffle, the band being prevented from rotating with the ruiile by means of a resilient anchoring member conveniently constituted by a rod one end of which is connected to the band while the other end is connected to the frame of the loom by means of a spring.

The spring controlling the tension of the band about the rattle, and hence the drag on the warp beam, and also the spring controlling the anchoring rod are each preferably adjustable. In this way it is possible to vary the drag exerted on the warp beam independently of the spring for absorbing shocks due to the movements of the healds so that the apparatus can be adjusted to suit all classes of work.

The band conveniently comprises two parallel chains having their ends connected together so as to form in effect a double chain. One end of this band carries a radial projection through which passes a spring- -controlled rod provided with a hook adapted to engage the other end of the band so' as to draw the two ends of the band together, and the hook conveniently engages an eccentric mounted on a manually rotatable pivot so that by rotating the pivot the tension of the band can be relieved without altering the normal adjusting mechanism.

The invention may be carried out in various ways but two constructions according to this invention are illustrated somewhat diagrammatically by way of example in the accompanying drawings, in which- Figure l is a plan view of one construction.

Figure 2 is a side elevation partly in section of the construction shown in Figure 1.

Figure 3 is a similar view to Figure 2 of an alternative construction, the ruffle being shown in section.

Figure a is an elevation of the tensionrelieving lever employed in the construction shown in Figure 3.

In the construction illustrated in Figures 1 and 2, A is the warp beam carrying warp threads A and provided at its end with a ruffle B. Encircling the ruflie B is a double chain C to one end of which is pivotally connected a member D which is formed with a hook D adapted to engage the other end of the chain C. The member D thus constitutes a toggle lever by means of which the ends of the chain C can be drawn together. The tension in the chain C is maintained by an adjustable spring connection arranged to act on the free end D of the member D. This connection comprises a rod F having a hook F at one end engaging a pin G carried between two radial projections C on a specially shaped link C of the chain C. The rod F passes through a slot D in the member D and is screwthreaded at its outer end to receive an adjusting nut G. A thrust member G is mounted to slide upon the rod F and to engage the free end I) of the member D and a compression spring G is interposed between the nut G and thrust member G so as to cause the thrust member G to act on the free end D of the member D and thus maintain the chain C in tension. The pin C" is eccentrically mounted in the projections C and carries a lever C at its outer end by means of which it can be rotated. In this way by rotating the pin 0, the tension of the chain C may be relieved in a rapid manner without moving the adjusting nut G.

The chain C is anchored to the frame H of the loom by means of a rod J connected at one end to a pin C carried between the two halves of the chain. The other end of the rod J passes through a hole in a bracket H secured to the frame H and is screwthreaded at its free end to receive an adjusting nut J, two compression springs K and K being disposed between the nut J and the bracket H. A collar H is provided on the rod J to limit the movement of the rod under the action of the springs K and K, this collar being movable along the rod J and adapted to be maintained in any desired position thereon by means of a set screw H In the alternative construction illustrated in Figures 3 and 4;, the chain C encircling the ruliie B is provided at one end with a link having a radial projection C through a hole in which passes a rod L provided at one end with a hook L and screwthreaded at its other end as at L A compression spring M encircles and controls the rod Ii and is adjustable by means of a nut L mounted on the screwthreaded portion L of the rod. The other end of the chain C carries a lever N pivoted at N and provided with an eccentric pin N adapted to be engaged by the hook L so as to draw the ends of the chain C together. In this construction the tension in the chain G can be relieved by operation of the lever N without altering the setting of the nut M.

It will be seen that with an arrangement according to this invention, the drag on the warp beam can be adjusted independently of the shock-absorbing means so that it is possible to obtain, for example, a light drag with a heavy shock-absorbing effect or a heavy drag and a light shock-absorbing effect, thus enabling the best combination to be used for ensuring good weaving of every class of goods. Further very heavy goods can be woven without resort to double back carriers or large beam ruffles.

It is to be understood that the constructional details may be varied within wide limits without departing from this invention.

What we claim as our invention and desire to secure by Letters Patent is 1. In a tension mechanism for the warp beams of looms, the combination of a warp beam, a friction drum on the end of the warp beam having a cylindrical bearing surface, two parallel chains wrapped around the drum, the links of said chains having curved surfaces adapted to bear on said cylindrical surface, a bridge piece connecting the ends of said chains, a spring acting 011 said bridge piece and tending solely to draw the two ends of the chains together about the drum, means for varying the effective force of this spring, means for releasing the tension of the band about the drum independently of the spring-adjusting means, a rod connected at one end to some convenient point in the band, a spring interposed between the other end of the rod and some relatively stationary part of the loom, and means for varying the effective force of this spring.

2. In tension merchanism for the warp beams of looms, the combination of a warp beam, a friction drum on the end of the warp beam having a cylindrical bearing surface, two parallel chains wrapped around the drum, the links of said chains having curved surfaces adapted to bear on said cylindrical surface, a toggle lever connecting the ends of said chains and adapted to tighten said chains about the drum, a rod pivotally connected at one end to said chains and passing thru an aperture in said lever, a member adjustable longitudinally of said rod, and a spring bearing at one end upon said member and at the other end upon said lever.

3. In tension mechanism for the warp beams of looms, the combination of a warp beam, a friction drum on the end of the warp beam having a cylindrical bearing surface, two parallel chains wrapped around the drum, the links of said chains having curved surfaces adapted to bear on said cylindrical surface, a toggle lever connecting the ends of said chains and adapted to tighten said chains about the drum, a rod passing thru an aperture in said lever, an eccentric rotatably mounted on said chain, one end of said rod being pivotally secured to said eccentric, a member adjustable longitudinally of said rod, and a spring bearing at one end upon said member and at the other end upon said lever.

4. In tension mechanism for the warp beams of looms, the combination of a warp beam, a friction drum on the end of the warp beam, a chain wrapped around the drum, an eccentric rotatably mounted on said chain, a rod having one end pivotally secured to said eccentric, a member secured to one end of said chain and having an aperture thru which said rod passes, a member adjustable longitudinally of said rod, and a spring compressed between said members, whereby by moving the longitudinally adjustable member the friction of the chain on the drum may be varied, and whereby by rotating the eccentric the chain may be released without disturbing the adjustment of the longitudinally adjustable member.

In testimony whereof We have signed our names to this specification.

THOMAS MOUNSEY. ROBERT BAGIVELL. 

